LARS BROWNWORTH, a former high-school history teacher, is the creator of the podcast phenomenon “12 Byzantine Rulers” that iTunes named as one of the “podcasts that define the genre.” Brownworth and his podcast have been profiled in the New York Times, Wired, and USA Today, and were featured on NPR.

Filled with unforgettable stories of emperors, generals, and religious patriarchs, as well as fascinating glimpses into the life of the ordinary citizen, Lost to the West reveals how much we owe to the Byzantine Empire that was the equal of any in...